New bugs: Crash when squad spawning in vehicle, tdm no sound bug, vehicle's gunner weapon bugged

Description of squad spawn crash:

- When you've just joined/started a game and you try to squad spawn inside a vehicle you may crash

Description of TDM no sound bug:

- Sometimes when you just joined a TDM game, there is no sound, fixed if you play out the entire round

Description of vehicle gunner no weapon bug:

- Sometimes the gunner's weapon is replaced by a non-functional UI and no weapon or functions

- This has happened to the MBT mostly for me, but also for attack helicopter gunner seat